From af89bfa000baefdee682902fd200871717161e1f Mon Sep 17 00:00:00 2001
From: AJ ONeal <aj@daplie.com>
Date: Sat, 11 Feb 2017 15:41:01 -0700
Subject: [PATCH] begin packer and test

---
 dns.packer.js  | 33 ++++++++++++++++++++++++++++++---
 dns.parser.js  |  2 +-
 test/packer.js | 44 +++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 74 insertions(+), 5 deletions(-)

diff --git a/dns.packer.js b/dns.packer.js
index 17c8ef2..dc2e5b9 100644
--- a/dns.packer.js
+++ b/dns.packer.js
@@ -1,9 +1,36 @@
 (function (exports) {
 'use strict';
 
-exports.DNS_PACKER = {
-  pack: function () {
-    throw new Error("DNS Packer Not Implemented");
+var dnspack = exports.DNS_PACKER = {
+  pack: function (packet) {
+    var total = 0;
+    var id = packet.header.id;                      // 2 bytes
+    total += 2;
+    var header = dnspack.packHeader(packet.header); // 2 bytes
+    total += 2;
+
+    var ab = new ArrayBuffer(total);
+    var dv = new DataView(ab);
+    dv.setUint16(0, id, false);
+    dv.setUint16(2, header, false);
+
+    return ab;
+  }
+, packHeader: function(h) {
+    var val = 0;
+
+    val += (h.qr     << 15) & 0x8000;
+    val += (h.opcode << 11) & 0x7800;
+    val += (h.aa     << 10) &  0x400;
+    val += (h.tc     <<  9) &  0x200;
+    val += (h.rd     <<  8) &  0x100;
+    val += (h.ra     <<  7) &   0x80;
+    val += (h.res1   <<  6) &   0x40;
+    val += (h.res2   <<  5) &   0x20;
+    val += (h.res3   <<  4) &   0x10;
+    val += h.rcode          &    0xF;
+
+    return val;
   }
 };
 
diff --git a/dns.parser.js b/dns.parser.js
index 858451a..237b389 100644
--- a/dns.parser.js
+++ b/dns.parser.js
@@ -46,7 +46,7 @@ pdns.unpackOpt = function (ab, packet, rec) {
   // TODO index into the correct place in the ArrayBuffer
   dv = new DataView(new ArrayBuffer(4));
   // rec.ttl is actually 1 (extended_rcode), 1 (edns_version), 2:1 (DO), 2:7 (Z)
-  dv.setUint32(0, packet.ttl);
+  dv.setUint32(0, packet.ttl, false);
   // is xrcode this edns_options?
   packet.xrcode = '0x' + dv.getUint8(0, false).toString(16);
   if ('0x0' === packet.xrcode) {
diff --git a/test/packer.js b/test/packer.js
index 2c742c1..d012419 100644
--- a/test/packer.js
+++ b/test/packer.js
@@ -1,6 +1,48 @@
 ;(function () {
   'use strict';
 
-  throw new Error("packer tests not written");
+  var fs = require('fs');
+  var path = require('path');
+  var dnsjs = require('../').DNSPacket;
+
+  var dirname = path.join(__dirname, 'fixtures');
+  var expected; // shim
+  var onefile = process.argv[2];
+
+  var json = JSON.parse(fs.readFileSync(onefile, 'utf8'));
+
+  var ab = dnsjs.write(json);
+  //console.log(ab);
+  var ui8 = new Uint8Array(ab);
+  //console.log(ui8);
+  var bytecount = 0;
+  var str = [].slice.call(ui8).map(function (i) {
+    var h = i.toString(16);
+    if (h.length < 2) {
+      h = '0' + h;
+    }
+    return h;
+  }).join('').match(/.{1,2}/g).join(' ').match(/.{1,47}/g).map(function (str) {
+    var lead = bytecount.toString(16);
+    bytecount += 10;
+
+    while (lead.length < 8) {
+      lead = '0' + lead;
+    }
+
+    return lead + ' ' + str;
+  }).join('\n');
+  var trail = ab.byteLength.toString(16);
+  while (trail.length < 8) {
+    trail = '0' + trail;
+  }
+
+  console.log('');
+  console.log('DEBUG with hexdump: ');
+  console.log('hexdump ' + onefile.replace(/\.[^\.]*$/, '.bin'));
+  console.log('');
+  console.log(str + '\n' + trail);
+  console.log('');
+
 }());